/* 优化后的CSS - 移除不必要的动画和装饰效果 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    position: relative;
}

/* 简化的容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
}

.container-small {
    max-width: 700px;
    padding: 40px;
}

.container-medium {
    max-width: 900px;
    padding: 35px;
}

.container-large {
    max-width: 1200px;
    padding: 30px;
}

/* 保留必要的动画 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* 表单样式优化 */
.form-control {
    border: 2px solid #e3f2fd;
    border-radius: 12px;
    padding: 12px 16px;
    font-size: 16px;
    transition: border-color 0.2s ease;
}

.form-control:focus {
    border-color: #2196f3;
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

/* 按钮样式优化 */
.btn-primary {
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
    border: none;
    border-radius: 12px;
    padding: 12px 24px;
    font-weight: 600;
    transition: transform 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, #1976d2 0%, #1565c0 100%);
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 50%, #90caf9 100%) !important;
    box-shadow: 0 4px 15px rgba(33, 150, 243, 0.1);
    border: none;
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.6rem;
    color: #1565c0 !important;
}

/* 表格样式 */
.table {
    background: white;
    border-radius: 12px;
    overflow: hidden;
}

.table th {
    background: #f8f9fa;
    border: none;
    font-weight: 600;
    color: #495057;
}

.table td {
    border: none;
    border-bottom: 1px solid #e9ecef;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 15px;
    }
    
    .container-small {
        padding: 25px;
    }
    
    .navbar-brand {
        font-size: 1.4rem;
    }
}

@media (max-width: 480px) {
    .container {
        margin: 5px;
        border-radius: 12px;
    }
    
    .container-small {
        padding: 20px;
    }
}